Actually in Bible times a year was 360 days, so in Bible prophecies one year equals 360 days not 365. For example, the 1260 years of papal reign and dark ages in Daniel 7:25 and Revelation 12:14 are based on the Biblical 360-day year. The dark ages were exactly 1260 days/years from 538 AD to 1798 AD, and in Rev. 13:5 the time is given in months. As a matter of fact, have you noticed Jesus was born in 4 BC? This is because the first time His birth was calculated it was done on the 365-day year instead of the 360-day year.

Below is a chart showing how we know the Biblical year was based on 360 days instead of 365, and that the biblical month had 30 days.